That is because a former top defence chief suspected of involved in the killing is contesting the polls.

The CID has uncovered details about the involvement of this person as well as powerful figures in the previous government.

The probe is nearing its completion, say police sources, with all suspects identified and to be arrested.

Investigations revealed that Wickramatunga’s car was ambushed and shot at by members of the military in motorcycles.

Police had not carried out a proper investigation into the murder that had taken during the previous regime.